################################################################################
# Copyright (c) 2018 Advanced Micro Devices, Inc. All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
################################################################################

# Parses the VERSION_STRING variable and places the first, second and third number values
# in the major, minor and patch variables.
function(rocprofiler_parse_version VERSION_STRING)

    string(FIND ${VERSION_STRING} "-" STRING_INDEX)

    if(${STRING_INDEX} GREATER -1)
        math(EXPR STRING_INDEX "${STRING_INDEX} + 1")
        string(SUBSTRING ${VERSION_STRING} ${STRING_INDEX} -1 VERSION_BUILD)
    endif()

    string(REGEX MATCHALL "[0123456789]+" VERSIONS ${VERSION_STRING})
    list(LENGTH VERSIONS VERSION_COUNT)

    if(${VERSION_COUNT} GREATER 0)
        list(GET VERSIONS 0 MAJOR)
        set(VERSION_MAJOR
            ${MAJOR}
            PARENT_SCOPE)
        set(TEMP_VERSION_STRING "${MAJOR}")
    endif()

    if(${VERSION_COUNT} GREATER 1)
        list(GET VERSIONS 1 MINOR)
        set(VERSION_MINOR
            ${MINOR}
            PARENT_SCOPE)
        set(TEMP_VERSION_STRING "${TEMP_VERSION_STRING}.${MINOR}")
    endif()

    if(${VERSION_COUNT} GREATER 2)
        list(GET VERSIONS 2 PATCH)
        set(VERSION_PATCH
            ${PATCH}
            PARENT_SCOPE)
        set(TEMP_VERSION_STRING "${TEMP_VERSION_STRING}.${PATCH}")
    endif()

    if(DEFINED VERSION_BUILD)
        set(VERSION_BUILD
            "${VERSION_BUILD}"
            PARENT_SCOPE)
    endif()

    set(VERSION_STRING
        "${TEMP_VERSION_STRING}"
        PARENT_SCOPE)

endfunction()

# Gets the current version of the repository using versioning tags and git describe.
# Passes back a packaging version string and a library version string.
function(rocprofiler_get_version DEFAULT_VERSION_STRING)

    rocprofiler_parse_version(${DEFAULT_VERSION_STRING})

    find_program(GIT NAMES git)

    if(GIT)

        execute_process(
            COMMAND "git describe --dirty --long --match [0-9]* 2>/dev/null"
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
            OUTPUT_VARIABLE GIT_TAG_STRING
            OUTPUT_STRIP_TRAILING_WHITESPACE
            RESULT_VARIABLE RESULT)

        if(${RESULT} EQUAL 0)

            rocprofiler_parse_version(${GIT_TAG_STRING})

        endif()

    endif()

    set(VERSION_STRING
        "${VERSION_STRING}"
        PARENT_SCOPE)
    set(VERSION_MAJOR
        "${VERSION_MAJOR}"
        PARENT_SCOPE)
    set(VERSION_MINOR
        "${VERSION_MINOR}"
        PARENT_SCOPE)
    set(VERSION_PATCH
        "${VERSION_PATCH}"
        PARENT_SCOPE)
    set(VERSION_BUILD
        "${VERSION_BUILD}"
        PARENT_SCOPE)

endfunction()